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      <h1 id="MyBatis-使用注解开发"><a href="#MyBatis-使用注解开发" class="headerlink" title="MyBatis 使用注解开发"></a>MyBatis 使用注解开发</h1><h2 id="面向接口编程"><a href="#面向接口编程" class="headerlink" title="面向接口编程"></a>面向接口编程</h2><ul>
<li><p>真正的开发中，很多时候我们会选择面向接口编程</p>
</li>
<li><p><strong>根本原因 : 解耦 , 可拓展 , 提高复用 , 分层开发中 , 上层不用管具体的实现 , 大家都遵守共同的标准 , 使得开发变得容易 , 规范性更好</strong></p>
</li>
<li><p>在一个面向对象的系统中，系统的各种功能是由许许多多的不同对象协作完成的。在这种情况下，各个对象内部是如何实现自己的,对系统设计人员来讲就不那么重要了</p>
</li>
<li><p>而各个对象之间的协作关系则成为系统设计的关键。小到不同类之间的通信，大到各模块之间的交互，在系统设计之初都是要着重考虑的，这也是系统设计的主要工作内容。面向接口编程就是指按照这种思想来编程。</p>
</li>
</ul>
<h3 id="关于接口的理解"><a href="#关于接口的理解" class="headerlink" title="关于接口的理解"></a>关于接口的理解</h3><ul>
<li><p>接口从更深层次的理解，应该是定义（规范，约束）与实现（名实分离的原则）的分离</p>
</li>
<li><p>接口的本身反映了系统设计人员对系统的抽象理解</p>
</li>
<li><p>接口应该有两类：</p>
<ul>
<li>第一类是对一个个体的抽象，它可对应为一个抽象体（abstract class）;</li>
<li>第二类是对一个个体某一方面的抽象，即形成一个抽象面（interface）;</li>
</ul>
<p><strong>一个个体有可能有多个抽象面，抽象体和抽象面是有区别的</strong></p>
</li>
</ul>
<h3 id="三个面向的区别"><a href="#三个面向的区别" class="headerlink" title="三个面向的区别"></a>三个面向的区别</h3><ul>
<li>面向对象：考虑问题时，以对象为单位，考虑它的属性及方法</li>
<li>面向过程：考虑问题时，以一个具体的流程（事务过程）为单位，考虑它的实现</li>
<li>接口设计与非接口设计是针对复用技术而言的，与面向对象（过程）不是一个问题.更多的体现就是对系统整体的架构</li>
</ul>
<a id="more"></a>

<h2 id="利用注解开发"><a href="#利用注解开发" class="headerlink" title="利用注解开发"></a>利用注解开发</h2><ul>
<li><strong>mybatis最初配置信息是基于 XML ,映射语句(SQL)也是定义在 XML 中的。而到MyBatis 3提供了新的基于注解的配置。</strong></li>
<li><strong>不幸的是，Java 注解的的表达力和灵活性十分有限。最强大的 MyBatis 映射并不能用注解来构建</strong></li>
</ul>
<p>sql类型主要分成：</p>
<ul>
<li>@select()</li>
<li>@update()</li>
<li>@Insert()</li>
<li>@delete()</li>
</ul>
<p>【注意】利用注解开发就不需要mapper.xml映射文件了 .</p>
<p>步骤1：在我们的接口中添加注解</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Mapper</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Select</span>(<span class="string">"select id,name,pwd as password from user"</span>)</span><br><span class="line">    <span class="function">List&lt;User&gt; <span class="title">getUserList</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>步骤2：在mybatis的核心配置文件中注入</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--    每一个Mapper,XML都需要在mybatis核心配置文件中注册--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">mappers</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">mapper</span> <span class="attr">class</span>=<span class="string">"com.zhuuu.dao.Mapper"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">mappers</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>步骤3：去进行测试</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testGetAllUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    SqlSession session = MybatisUtils.getSession();</span><br><span class="line">    <span class="comment">//本质上利用了jvm的动态代理机制</span></span><br><span class="line">    UserMapper mapper = session.getMapper(UserMapper<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line">   List&lt;User&gt; users = mapper.getAllUser();</span><br><span class="line">    <span class="keyword">for</span> (User user : users)&#123;</span><br><span class="line">        System.out.println(user);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    session.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="Debug查看本质"><a href="#Debug查看本质" class="headerlink" title="Debug查看本质"></a>Debug查看本质</h3><p><img src="https://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200217111313.png" alt=""></p>
<p><strong>本质上利用了jvm动态代理机制</strong></p>
<p><img src="https://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200217111422.png" alt=""></p>
<h3 id="MyBatis详细的执行流程"><a href="#MyBatis详细的执行流程" class="headerlink" title="MyBatis详细的执行流程"></a>MyBatis详细的执行流程</h3><p><img src="https://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200217111534.png" alt=""></p>
<h2 id="注解实现增删改"><a href="#注解实现增删改" class="headerlink" title="注解实现增删改"></a>注解实现增删改</h2><h3 id="自动实现提交事务"><a href="#自动实现提交事务" class="headerlink" title="自动实现提交事务"></a>自动实现提交事务</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//改造MybatisUtils工具类的getSession( ) 方法，重载实现。【鸡汤：多看源码实现】</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//获取SqlSession连接</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> SqlSession <span class="title">getSession</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="keyword">return</span> getSession(<span class="keyword">true</span>); <span class="comment">//事务自动提交</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> SqlSession <span class="title">getSession</span><span class="params">(<span class="keyword">boolean</span> flag)</span></span>&#123;</span><br><span class="line">    <span class="keyword">return</span> sqlSessionFactory.openSession(flag);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>【注意】确保实体类和数据库字段对应</p>
<h3 id="查询"><a href="#查询" class="headerlink" title="查询"></a>查询</h3><ol>
<li>编写接口方法注解</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//根据id查询用户</span></span><br><span class="line"><span class="meta">@Select</span>(<span class="string">"select * from user where id = #&#123;id&#125;"</span>)</span><br><span class="line"><span class="function">User <span class="title">selectUserById</span><span class="params">(@Param(<span class="string">"id"</span>)</span> <span class="keyword">int</span> id)</span>;</span><br></pre></td></tr></table></figure>

<ol start="2">
<li>测试</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testSelectUserById</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    SqlSession session = MybatisUtils.getSession();</span><br><span class="line">    UserMapper mapper = session.getMapper(UserMapper<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line">    User user = mapper.selectUserById(<span class="number">1</span>);</span><br><span class="line">    System.out.println(user);</span><br><span class="line"></span><br><span class="line">    session.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="新增"><a href="#新增" class="headerlink" title="新增"></a>新增</h3><ol>
<li>编写接口方法注解</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//添加一个用户</span></span><br><span class="line"><span class="meta">@Insert</span>(<span class="string">"insert into user (id,name,pwd) values (#&#123;id&#125;,#&#123;name&#125;,#&#123;pwd&#125;)"</span>)</span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">addUser</span><span class="params">(User user)</span></span>;</span><br></pre></td></tr></table></figure>

<ol start="2">
<li>测试</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testAddUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    SqlSession session = MybatisUtils.getSession();</span><br><span class="line">    UserMapper mapper = session.getMapper(UserMapper<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line">    User user = <span class="keyword">new</span> User(<span class="number">6</span>, <span class="string">"朱酱酱"</span>, <span class="string">"123456"</span>);</span><br><span class="line">    mapper.addUser(user);</span><br><span class="line"></span><br><span class="line">    session.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="修改"><a href="#修改" class="headerlink" title="修改"></a>修改</h3><ol>
<li>编写接口方法注解：</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//修改一个用户</span></span><br><span class="line"><span class="meta">@Update</span>(<span class="string">"update user set name=#&#123;name&#125;,pwd=#&#123;pwd&#125; where id = #&#123;id&#125;"</span>)</span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">updateUser</span><span class="params">(User user)</span></span>;</span><br></pre></td></tr></table></figure>

<ol start="2">
<li>测试</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testUpdateUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    SqlSession session = MybatisUtils.getSession();</span><br><span class="line">    UserMapper mapper = session.getMapper(UserMapper<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line">    User user = <span class="keyword">new</span> User(<span class="number">6</span>, <span class="string">"朱酱酱帅"</span>, <span class="string">"zxcvbn"</span>);</span><br><span class="line">    mapper.updateUser(user);</span><br><span class="line"></span><br><span class="line">    session.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="删除"><a href="#删除" class="headerlink" title="删除"></a>删除</h3><ol>
<li>编写接口方法注解</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//根据id删除用</span></span><br><span class="line"><span class="meta">@Delete</span>(<span class="string">"delete from user where id = #&#123;id&#125;"</span>)</span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">deleteUser</span><span class="params">(@Param(<span class="string">"id"</span>)</span><span class="keyword">int</span> id)</span>;</span><br></pre></td></tr></table></figure>

<ol start="2">
<li>测试</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testDeleteUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    SqlSession session = MybatisUtils.getSession();</span><br><span class="line">    UserMapper mapper = session.getMapper(UserMapper<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line">    mapper.deleteUser(<span class="number">6</span>);</span><br><span class="line">    </span><br><span class="line">    session.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>【注意点：增删改一定记得对事务的处理】</p>
<h2 id="关于-Param"><a href="#关于-Param" class="headerlink" title="关于@Param"></a>关于@Param</h2><p>@Param注解用于给方法参数起一个名字。以下是总结的使用原则：</p>
<ul>
<li>在方法只接受一个参数的情况下，可以不使用@Param</li>
<li>在方法接受多个参数的情况下，建议一定要使用@Param注解给参数命名</li>
<li>如果参数是JavaBean，则不能使用@Param</li>
<li>不使用@Param注解时，参数只能有一个，并且是Javabean</li>
</ul>
<h2 id="关于-和-的区别"><a href="#关于-和-的区别" class="headerlink" title="关于#和$的区别"></a>关于#和$的区别</h2><ul>
<li><code>#{}</code> 的作用主要是替换预编译语句(PrepareStatement)中的   占位符?    【推荐使用】</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">INSERT INTO user (name) VALUES (#&#123;name&#125;);</span><br><span class="line">INSERT INTO user (name) VALUES (?);</span><br></pre></td></tr></table></figure>

<ul>
<li>${} 的作用是直接进行字符串的替换</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">INSERT INTO user (name) VALUES (&#39;$&#123;name&#125;&#39;);</span><br><span class="line">INSERT INTO user (name) VALUES (&#39;Zhuuu&#39;);</span><br></pre></td></tr></table></figure>


      
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